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8424-11 Morass Creek Alluvial Plain

This information has been developed from the publications:

    • Sites of Geological and Geomorphological Significance in Central Gippsland (1981) by Neville Rosengren, M.S McRae-Williams and S.M Kraemers.
    • Sites of Geological and Geomorphological Significance in the Gippsland Lakes Catchment (1984) by Neville Rosengren.
    • Sites of Geological and Geomorphological Significance in East Gippsland, Victoria (1981) by Neville Rosengren, M.S McRae-Williams
Geological heritage sites, including sites of geomorphological interest and volcanic heritage sites, are under regular revision by the Geological Society of Australia, especially in the assessment of significance and values. Reference should be made to the most recent reports. See the Earth Science Heritage section of the Geological Society of Australia website for details of geological heritage reports, and a bibliography.


670100. Four kilometres east of Benambra.

Image:  East Gippsland Sites of Significance
Morass Creek, Benambra. Alluvial basin (A). Gorge (B). Drained Swampland (C). Alluvial fan (D). Terraces (E).


Alluvial basin with swampland, terrace and an alluvial fan.


Mount Leicester Road.


Private Land.


At this locality Morass Creek occupies an extensive alluvial basin cut in Ordovician sediments and metamorphic rocks. It has been suggested that alluvial deposition resulted from the damming of Morass Creek by basalt flows to the north. In addition, it is likely that the stream gradient of Morass Creek was reduced by back tilting on Morass Creek Fault and other sub parallel faults, causing deposition of sediment in the area east of Benambra.

The alluvial basin in characterised by extensive terrace and swamp development. Morass Creek originally flowed through the swampland without a clearly defined channel, but low level discharges are now confined to an artificially constructed drainage channel. Of additional interest, is the small alluvial fan projecting into the swampland at the moth of Sandy Creek.


Regional. The area displays a series of fluvial landforms, which have originated through channel blockage and fault movements. Such a landform assemblage is of particular interest as it provides information on past climatic regimes and faulting history.


The site has been extensively modified by drainage of Morass Creek flat and it is recommended that no further drainage of the remaining wetlands be permitted.


Crohn, P.W. 1950. 'The geology, petrology and physiography of the Omeo District, North-Eastern Victoria', Proc. R. Soc. Vict., 62 :1-70.

8424 11
Site 8424-11

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